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This is a nice little air pump to tide one over in short-term emergencies. It comes with its own airline and air stone. While the airline supplied is very short, one can always attach a longer airline, or use one's own air stone. The idea behind the short airline is to supply surface agitation while avoiding stirring up debris from deeper in the tank. This product requires D batteries, common in most households. It is noisy, but in an emergency, noise is unimportant. If one uses this pump below the water level of the tank, be sure to install an anti-siphon valve in the airline. This is small enough and compact enough, it can sit right on top of the lid of the tank with the airline right at the surface, and the closed lid acting as a clamp to hold it in place. I recommend keeping one on hand as a backup air supply for every aquarium. It can be ordered through Foster and Smith.